US 20060268218 A1
Front for full-rim glasses frames with a holding device and rapid fixing of the lenses to the frame. The front being of the type with a monopiece arch transversely projected with respect to the face of the user, which includes, at the temporal ends, two shaped and curved cross-pieces joined by a connecting intermediate nose bridge. Each cross-piece provides hinging of the related side, and each cross-piece near to the intermediate connecting nose bridge provides a curved projection, which provides a first of the two ends of flexible holders that partially enclose the peripheral edge of the lens to be joined to the front, the other side being provided with a second end, introduced by a through-hole obtained in correspondence to the temporal region of the front, that is equipped with a tooth that engages unidirectionally the portion of the second end of the flexible holders.
1. Front for full-rim glasses frames, with a holding device and rapid fixing of lenses to a frame, said front comprising:
a monopiece arch transversely projected with respect to a face of a user;
two shaped and curved cross-pieces at temporal ends of the arch, joined by a connecting intermediate nose bridge, wherein each cross-piece in correspondence to the intrados, relative to the lateral nose, comprise means for the hinging of the related side; and
a curved projection, in each cross-piece near to the intermediate connecting nose bridge, slightly directed towards a lower side of the glasses, having a first of two ends of a holding flexible means that partially enclose the peripheral edge of the lens to be joined to the front, wherein a flexible holding means of a second end are provided with a second holding means, introduced unidirectionally by a through-hole obtained in correspondence to the temporal region of the front, said through-hole being provided with a hook that engages said second end of the flexible holding means.
2. Front for full-rim glasses frames with a holding device and rapid fixing of the lenses to the frame, according to
3. Front for full-rim glasses frame with holding device and rapid fixing of the lenses to the frame, according to
a through hole, at the side of each cross-piece in correspondence to the nose, crossing rectilinearly and locally a thickness of the cross-piece, with an almost vertical orientation, wherein a hook or tooth is obtained in a projecting way inside said hole, said hook or tooth being monolithically obtained from the same material from which the arch is obtained.
4. Front for full-rim glasses frames with holding device and rapid fixing of the lenses to the frame, according to
a band for each cross-piece joined of the type obtained in flexible plastic material which in correspondence to least one facade has a portion that is locally toothed and directed towards the tapered end.
5. Front for full-rim glasses frame with holding device and rapid fixing of the lenses to the frame, according to
6. Front for full-rim glasses frames, with holding device and rapid fixing of the lenses to the frame, according to
7. Front for full-rim glasses frames with holding device and rapid fixing of the lenses to the frame, according to
8. Front for full-rim glasses frames with holding device and rapid fixing of the lenses to the frame, according to
The aim of this invention is a front for full-rim glasses frames with a holding band device and rapid fixing of the lenses to the frame.
The invention finds particular although not exclusive application in the field of the manufacturing of the frames and assembly of glasses.
Conventionally, glasses frames are made up of a front, the frame of which provides a monolithic body shaped curvilinearly in order to comprise two adjacent symmetrical rims that support and engage the lenses that are joined by an intermediate connecting nose bridge. The frame is completed by the sides, which are engaged to the front along the exterior of each rim by means of a nose and the relative articulation that projects perpendicularly in correspondence to the surface that looks at the face.
For the assembly of the lenses, a frame of this type requires the rims to have a certain elasticity, a function that substantially depends on the characteristics of the material used. In the case of the usual material such as cellulose acetate, the frame is induced to yield in correspondence to the rim of the glasses in order to allow the introduction of the lens that will then be held perimetrically, it is a relatively simple operation which requires minimum handling. Operationally, it is necessary to exert a force that produces, from the interior of the rim towards the exterior, a temporary and localized yielding, possibly with pre-heating, in such a way as to introduce the lens by exerting a light pressure. In order to allow the effective holding of the lens, both the edge of the lens along the perimeter, as well as the rim profile are shaped and counter-shaped to receive the corresponding portion to be held.
At present, it seems as if the assembly of the lenses to the corresponding frame is a consolidated and rather simple practice, also since the market offers numerous solutions intended to render the operation even simpler.
As a rule it is the opinion of the applicant that the solutions offered have still not achieved satisfactory results, above all in relation to the rapidity of assembly of the lenses to the front of the frame. In other words, for the most part it is not that simple to carry out the assembly or the substitution of the first lenses with second lenses, since this involves an operation that must be always be carried out by staff who are qualified and equipped for this aim, such as for example, an optical assistance center. And in fact, in order to carry out the assembly or the substitution, the technician uses a device that heats the rim of the glasses locally, making the frame, once softened, deform the necessary amount for the lens to come out from the seat itself. Due to this, the operation can be carried out safely once every so often, while it is far more difficult if must be carried out with a greater frequency, as can occur for the assembly of large quantities of lenses or, for example, when there is need for the final user to substitute tinted lenses with others of a different tonality, without however resorting to the aid of the technician.
A more complex case is presented with the front, which is also full-rim, obtained in metal and that has rims with a continuity solution. These fronts, due to the material that is essentially less elastic than the first materials, present greater lens assembly difficulties since they require the use of particular and suitably sized tools to allow the disassembly and vice-versa. As a rule, said fronts provide the closure of the rims in correspondence with the noses by means of the juxtaposition of the ends and therefore by means of the clamping of a corresponding holding screw of said ends.
A further difference is presented in the case of frames that also have full-rim fronts but are obtained in metal wire. An example is given in EP0895114 (Hyoi) which suggests a frame consisting of an arched section that provides two semi-rims, joined by a relative connecting bridge, which are engaged in relation to each semicircle, through the lower semicircle portion, to a flexible cable string provided in correspondence to the two ends of the engagement rings.
Prior Art Closest to the Invention
GB698929 (Splaine) describes glasses consisting of a front whose monolithic frame in plastic material provides an arch which is higher than that to which the lenses are engaged, each being provided with a relative peripheral holding strip of the flexible type. Said arch, as a rule, presents a shape so as to comprise two cross-pieces, corresponding to the upper portion of the rims and a connecting nose bridge between said two cross-pieces. Furthermore, each cross-piece, on the side directed towards the flank of the glasses, has a portion that develops for a short section downwards, or rather along the temples, with a substantially curvilinear course. In the patent under consideration, it is foreseen that each lens is peripherally closed with a ring along the edge by a metallic material strip which provides the two juxtaposed ends near to the temporal region of the lenses, held together by a screw that simultaneously determines the fixing of said strip also to the arch. In one case, the cross-section of the metallic strip that encloses with a ring the edge of the lens can be of the “V” type so as to involve the entire thickness of the lens, or alternatively with a round section, in this hypothesis obviously only involving a minimum portion of the peripheral profile of said lens. Among the aims of said solution, there is the possibility of combining a mixed structure consisting of plastic parts and metal parts, effectively joined in such a way as to provide an amortizing function to allow a release in case of stresses and therefore for optimum adaptation to the weather conditions. A second aim consists, unlike the use of the most common plastic materials, in enlarging the visual surface thanks to the significant reduction of thickness that is implemented by means of the metallic strip in correspondence to the lower support portion of the lens. A third aim was also to facilitate assembly, also of the lenses, avoiding having to resort to holes being made in the latter for the assembly of the components.
In GB533161 (Chappell) a glasses assembly that provides a composite support front of the lenses is described. Also in this case, there is a monolithic arch, in metal or conventional plastic material, including two cross-pieces connected by an intermediate nose bridge, wherein each cross-piece provides at its end, corresponding to the flank of the glasses, a projection that is configured in such a way as to support, on the side that looks at the face of the user, a nose with the relative orthogonal articulation for hinging the side itself. The cross-piece portion, on the lower part with respect to the connecting nose bridge, provides for a short section, an interrupted projection, that develops in a slightly rounded way downwards to follow the profile of the edge of the lens and so as to provide, on the internal side of the glasses, the relative nose pad, also possibly in association with this and shaped in such a way as to project according to a usual anatomical shape. Moreover, a band made of metal or another material provided that it is flexible, which is embedded, with one end, in correspondence to said interrupted projection of each of the two opposite cross-pieces of the arch (see
As a rule, it is the opinion of the applicant that in the conventional proposals and in particular in both GB698929 (Splaine) and GB533161 (Chappell), the main problem relating to the faster assembly of the lenses to the front of the frame, in reality, has not yet been effectively solved.
With respect to both, in fact, there is the confluence of the small metallic components, such as screws, that oblige the manufacturer, in addition to the usual stocking and management of said screws, to carry out particular working that for minute dimensions during the lens assembly stage is not easy and involves specialized and attentive staff. Furthermore, the problem with the use of screw means, simply by their very the nature, makes glasses with little compactness, above with regard to time. In fact, it is known that the screws, on the strength of the often careless use of glasses, frequently tend to loosen, a circumstance that at best obliges the user to ensure regular maintenance of the glasses. In other cases, carelessness can cause the detachment of the essential parts, in this case of the band or at least of one end, with the consequent falling of the lenses.
A further inconvenience linked to the solution GB698929 (Splaine) is related to the fact that this solution concerns glasses which provide the band substantially detached from the front and furthermore in metal. There is no doubt that this circumstance requires particular handling in the lens assembly stage, since it requires the preventive assembly of the band to the lens and only after the assembly to the front, or rather to the cross-piece portion of the arch involved.
With respect to the solution suggested by GB533161 (Chappell) as well as GB698929 (Splaine), that flexibility necessary for the fixing of the lenses in relation to their different profile is not provided. This much is evident, since the form of the lens is not always oval, but can often assume different forms, also polygonal. From a practical point of view GB698929 (Splaine) has been obliged to provide a band closed with a ring with dimensions and profile, although flexible, as close as possible to the form of the lens to be fixed, which results in a large availability of bands that is as large as the forms of the lenses most commonly used.
In the same way and perhaps it is even noticeable in GB533161 (Chappell), there is a substantial limitation of use. In fact, it is evident that the length of the band is to be predetermined just as the fixing point of the end not connected to the band of the arch is pre-fixed. These two conditions, consequently, cannot vary according to a different profile of the lens for which the band has been designed.
As a rule, these and other drawbacks make the frames of this type unsuitable for optimally satisfying the multiple needs of the manufacturers.
Therefore, the need for companies, particularly in this sector, to find more effective alternative solutions, with respect to solutions in existence up to now is important.
The aim of this invention is also to avoid the drawbacks described.
This and other aims are achieved with this invention according to the characteristics in the included claims solving the problems disclosed by means of a front for full-rim glasses frames, with a holding device and rapid fixing of the lenses to the frame, said front being of the type with a one-piece arch projecting transversely with respect to the face of the user, which comprises, at the temporal ends, two shaped and curved cross-pieces joined by a connecting intermediate nose bridge, wherein each cross-piece in correspondence to the intrados, relative to the lateral nose, provides means for the hinging of the related side, and in which each cross-piece near the connecting intermediate nose bridge forms a curved projection, slightly directed toward the lower side of the glasses, which provides the first of the two ends of a flexible holding means that partially encloses the peripheral border of the lens to be joined to the front, on the other hand being provided with a second end introduced through a passing hole obtained in correspondence to the temporal region of the front, said passing hole being equipped with a tooth that engages unidirectionally the portion of said second end of the flexible holding means.
In this way, through the considerable creative contribution, the effect of which has allowed the achievement of considerable technical progress, certain aims and advantages are achieved.
A first aim intends to obtain a glasses frame and in particular a front that is more comfortable and effective above all with respect to the assembly of the lenses, a operation that can be executed by an individual with little expertise, without screws and without the use of particular tools or fittings, using minimum effort and with times significantly lower than usual. With regard to assembly, an extreme aesthetic flexibility and design is revealed, provided by the possibility to vary the form of the lenses without changing the structure, similar to structure today known as rimless. Furthermore, the possibility of varying the materials that are also very different among themselves and rapid changing of said materials in case of breakages is observed.
A second aim consisted in allowing the production of compact glasses frames that ensure the uniform clamping and greater stability of the lenses to the front.
A third aim has allowed greater comfort and effectiveness of use, since the band, being flexible, is adaptable to any lens for the support of the latter to the arch of the glasses, independently of the peripheral development of the profile. It is not required, moreover to provide specific bands according to the dimensions of the perimeter of the lens. This makes it possible for the band used to be of the standard type, being obtained, with a constant length and with a locally toothed portion where the longitudinal development of the latter portion achieves for itself a certain tolerance margin in varying the perimetrical length of the edge of the lens.
One further aim was to contain the industrial costs, with low operating costs, having identical pieces that are adaptable to different forms.
Comparison with the Solutions Closest to the Prior Art
With reference to GB698929 (Splaine) the differences are rather important. Firstly, the band described by GB698929 (Splaine) is completely released from the front and is to be engaged with the lens, in such a way as to enclose it with a ring. Differently, the object of the invention is a band, that in some cases can certainly also be disengaged from the two ends by the front but it is not used to enclose the entire edge of the lens, since it can only involve a part of the perimeter of the lens at least equal to or a little more than the total peripheral development. GB698929 (Splaine), moreover, proposes a metallic band that as flexible as it is, never reaches the characteristics of good adaptability of a band in plastic material. With respect to the connection of the band to the front, it has been seen that GB698929 (Splaine) requires screws on the two sides of the band and there is no hole in correspondence to the arch where said band passes and is engaged. In fact, this circumstance renders impossible the logical development of GB698929 (Splaine) to achieve, using an average technician, the solution that is the object of the invention of the applicant.
In relation to GB533161 (Chappell), a significant difference consists in the fact that the band provides a different anchorage of the free end of the arch. GB533161 (Chappell), in fact does not allow the registration of the tension of the band in proximity of the temporal regions, that instead, in the solution that is the object of this invention, is made possible by the confluence in the band of a plurality of adjusting teeth and by the hook holding means provided in logical correspondence to the front. Furthermore, GB533161 (Chappell) also does not provide any through hole, through the arch to allow the engagement of the end of the band, nor on the other hand is a solution immediately deducible, since holding systems for lenses with toothed bands are not known. On the other hand, even if the front for GB533161 (Chappell) hypothesized a through-hole for the transit of said end, the fixing, even if in an adjustable way, due to the absence of notable anteriority, could only be supposed only with a screw, that pressing on the band would have determined a possible registration. The result is that the invention proposed today, however, due to the provision of the hook obtained in the hole with the participation of the toothing obtained in the band, would have achieved an improvement with respect to rapidity of assembly and without screws, therefore a sufficient inventive level.
In conclusion, a front for glasses has been achieved through good technological content.
These and other advantages will appear from the following detailed description of a preferred solution with the aid of the enclosed schematic drawings, whose execution details are not to be considered as limitative but only illustrative.
With reference to the
In a first solution, such as that of
In more detail, the end 122 is to be introduced into the through-hole 7 in such a way as to turn the locally toothed portion 121 towards the hook 8. Even more in particular, the shape of each tooth 121 a of the toothed portion 121 of the band 12 is characterized by an inclined surface 123 that has the function of an entrance chute, followed by an abutment wall 124 perpendicular to the band 12. The orientation of the surface of the inclined surface 123 is such as to allow the band 12 to be introduced in one direction, or rather from the bottom upwards, through the hole 7 and until the hook 8 accepts the toothed portion 121. By pulling the band 12 through the hole 7 it is possible to achieve the peripheral constriction of the lens 11 pushed against the lower edge of the respective cross-piece 30 of the arch 3. With that, and a greater pulling force, the improved holding of the lens 11 is achieved making the band 12, being slightly elastic, adapt itself peripherally and uniformly along the profile of said lens 11. The band 12, once introduced into the hole 7 and engaged by the hook 8 cannot return backwards, but can only possibly be adjusted further until reaching the desired tension. Therefore, the portion in excess of the end, projecting from the arch 3 is then cut and returned through the exit of the hole 7.
One variant to the band 12 illustrated before can consist in providing the opposite end to that used in the hole 7 embedded in the plastic material with which the arch 3 is obtained, rather than to be directly obtained from the cross-piece 30 of said arch.
More particularly, the end 125 of the band 12 opposite to that which is partially toothed 121, is provided with a cylindrical or spherical head 126, followed by a shackle joint 127 on the end portion 125 of the band 12, which presents smaller dimensions than the cylindrical or spherical head 126. In this way, the cylindrical or spherical head 126 of the band 12 is to be introduced into one corresponding countersunk bushing seat 41 that provides an entrance 42 that receives the shackle joint 127. Since there is the need to anchor two bands 12, respectively one for each cross-piece 40, there are two entrances 42 as well as two countersunk bushing seats 41, obtained on the two sides of the saddle that characterizes the lower edge of the connecting nose bridge 5. Finally, it is observed that the orientation of the entrances 42 that receive the shackle joints 127 is obtained in such a way as to intersect the tangent of the respective shoulder 10, since once the end 125 of the band 12 is anchored, the latter acts as a logical development of the closing of the holding rim of the lens 11.
With respect to the details of the band 12,
Another solution considers the fact that the hook 8 can be replaced by a washer, in this case made of steel, of the radial cut type that forms deformable petals. In this way, passing centrally through said washer, the flexible peripheral holding means of the lens 11, that in this case, in place of the band 12, are provided by a small flexible cable, for example in steel strands. The deformation of the petals of the washer towards the traction direction of the flexible cable, in fact determines the impossibility of return of said cable since the peaks of each petal peripherally push against the circular wall of the flexible cable.